[单项选择]His father has been suffering from lung cancer for half a year, so the doctor Suggest that he ___________ an operation as soon as possible.
A. takes
B. would take
C. took
D. should

[单项选择]Jason has been preparing carefully for his English examination so that he could be sure of passing it at his first ______.
A. purpose
B. desire
C. attempt
D. intention

[单项选择]

Cancer has always been with us, but not always in the same way. Its care and management have differed over time, of course, but so, too, have its identity, visibility, and meanings. Pick up the thread of history at its most distant end and you have cancer the crab—so named either because of the ramifying venous processes spreading out from a tumor or because its pain is like the pinch of a crab’s claw. Premodern cancer is a lump, a swelling that sometimes breaks through the skin in ulcerations producing foul-smelling discharges. The ancient Egyptians knew about many tumors that had a bad outcome, and the Greeks made a distinction between benign tumors (oncos) and malignant ones (carcinos). In the second century A. D. , Galen reckoned that the cause was systemic, an excess of melancholy or black bile, one of the body’s four "humors,, brought on by bad diet and environmental circumstances. Ancient medical practitioners sometimes cut tumors out, but the progno
A. called cancer the crab
B. were able to distinguish benign tumors and malignant ones
C. found out the cause of cancer
D. knew about a lot of malignant tumors

[填空题]
1. The death rate due to cancer of the lungs has increased more than 800 percent in males and has more than doubled in females during the last 25 years. It is considerably higher in urban and industrial areas than in rural districts. There are many possible causes, but it is still controversial which are most blameworthy. Those factors which have been mentioned most frequently are the presence of foreign particles and other irritants in the air (smoke particles, smog, exhaust fumes), and the smoking of cigarettes and cigars.
2. Numerous studies have demonstrated a striking correlation between the death rate from lung cancer and smoking habits. Among heavy smokers — 21 to 30 cigarettes per day — the mortality rate from lung cancer is nearly 17 times the rate from nonsmokers. It is expected the death rate among women will increase as the present high rate of smoking among women has its effect.
3. Sometimes cases

[填空题]The son has almost been driven mad by his parents’ (end)（）complaints.

[单项选择]Why has Mary been absent from class
A. She has been ill.
B. She has been in Mexico.
C. Some relatives have been visiting her.

[填空题]He has been working very hard and his schoolwork has shown much ______ (improve) since last term.