[填空题]Since mid-July 2011, a severe drought has been affecting the entire East Africa region. Said to be "the worst in 60 years", the drought has (47) a severe food crisis across Somalia, Ethiopia and Kenya that threatens the (48) of 10 million people. Many refugees from southern Somalia have fled to neighboring Kenya and Ethiopia, where crowded, unsanitary (不卫生的) (49) together with severe malnutrition (营养不良) have led to a large number of deaths. Other countries in and around the Horn of Africa, are also affected by a food crisis.
The UN added the (50) Bay region in Somalia to the list of famine-stricken areas. The UN has conducted several airlifts of supplies in addition to on-the-ground (51) , but humanitarian (人道主义的；人道主义者) response to the crisis has been hindered by a (52) lack of funding for international aid coupled with security issues in the region. As of September 2011, 63 percent of the UN’s appeal for
$ 2.

[填空题]Since mid-July 2011, a severe drought has been affecting the entire East Africa region. Said to be "the worst in 60 years", the drought has (47) a severe food crisis across Somalia, Ethiopia and Kenya that threatens the (48) of 10 million people. Many refugees from southern Somalia have fled to neighboring Kenya and Ethiopia, where crowded, unsanitary (不卫生的) (49) together with severe malnutrition (营养不良) have led to a large number of deaths. Other countries in and around the Horn of Africa, are also affected by a food crisis.
The UN added the (50) Bay region in Somalia to the list of famine-stricken areas. The UN has conducted several airlifts of supplies in addition to on-the-ground (51) , but humanitarian (人道主义的；人道主义者) response to the crisis has been hindered by a (52) lack of funding for international aid coupled with security issues in the region. As of September 2011, 63 percent of the UN’s appeal for
$ 2.

[单项选择]Since 1975 there has been in the United States a dramatic decline in the incidence of traditional childhood diseases such as measles. This decline has been accompanied by an increased incidence of Peterson’s disease, a hitherto rare viral infection, among children. Few adults, however, have been affected by the disease.
Which of the following, if true, would best help to explain the increased incidence of Peterson’s disease among children ？（）
A. Hereditary factors determine in part the degree to which a person is susceptible to the virus that causes Peterson’s disease.
B. The decrease in traditional childhood diseases and the accompanying increase in Peterson’s disease have not been found in any other country.
C. Children who contract measles develop an immunity to the virus that causes Peterson’s disease.
D. Persons who did not contract measles in childhood might contract measles in adulthood, in which case the consequences of the disease would generally be more severe.
E. Those who have contracted Peterson’s disease are at increased risk of contracting chicken pox.

[填空题]Electronic Waste
It has been known since ancient times that certain plants regularly open
their leaves in daytime and close them at night. It was assumed which this 62. ______
periodic change was triggered by the alternating sunlight and darkness. Such
leaves stick to their daily routine even when keeping in constant darkness. 63. ______
What is circadian rhythm Many biological processes follow a 24-hours 64. ______
schedule. These cycles are called circadian rhythms. These innate rhythms are
governed by sophisticated chemical mechanisms can be described as biological 65. ______
clocks. Such rhythms are important for humans too! We sleep through most
of the hours of darkness and are awaken through most of the hours of 66. ______
daylight. Body temperature increases during the day and decreases during the
night. The secretion of various hormones that controls life’s processes rises 67. __