[填空题]

Greyhound racing is the sixth most  (46)   spectator sport in the United States. Over the last decade, a growing number of racers have been  (47) to spend their retirement household pets, once their racing careers are over.
Many people hesitate to adopt a retired racing greyhound because they think only very old dogs are ava (48) Actually, even champion racers only work until they are about threeand-a half years old. Because greyhounds usually live to be 12 to 15years old, their retirement is much  (49)  than their racing careers.
People worry that a greyhound will be more  (50)  (nerve) and active than other breeds and will need a large sp (51)  to run. These are false Impressions. Greyhounds have naturally sweet, mild dispositions, and while they love to run, they are sprinters rather than distance runners and are  (52) . (sufficiency) exercised with a few dai

Greyhound racing is the sixth most (46) spectator sport in the United States. Over the last decade, a growing number of racers have been (47) to spend their retirement household pets, once their racing careers are over.
Many people hesitate to adopt a retired racing greyhound because they think only very old dogs are ava (48) Actually, even champion racers only work until they are about threeand-a half years old. Because greyhounds usually live to be 12 to 15years old, their retirement is much (49) than their racing careers.
People worry that a greyhound will be more (50) (nerve) and active than other breeds and will need a large sp (51) to run. These are false Impressions. Greyhounds have naturally sweet, mild dispositions, and while they love to run, they are sprinters rather than distance runners and are (52) . (sufficiency) exercised with a few daily laps around a fenced-in backyard.
Greyhounds

          浣溪沙
               周邦彦
楼上晴天碧四垂，楼前芳草接天涯。劝君莫上最高梯。
新笋已成堂下竹，落花都上燕巢泥。忍听林表杜鹃啼。

                                                                             Solar Storm
At the end of October 2003, a sudden solar storm hit the earth. A solar storm refers to the large amounts of charged particles released into space (1) the solar energy increases. The release of the energy (2) place along with the activity of the sunspots with a cycle of 11 years. This time, the (3) of the storm exceeded expectations.
This (4) of intense solar storm was caused by the eruption of a solar flare (闪光) and the ejection (喷发) of the solar coro
A. safe
B. dangerous
C. comfortable
D. manageable