They ________ extensive and possibly dangerous actual flight training.
A. undertake
B. undergo
C. underplay
D. underuse
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Don’t trust everything ________ you have read in the newspapers.
A. which
B. that
C. as
D. what
It is difficult to understand this kind of _______ calculation.
A. intricate
B. varied
C. indispensable
D. equable
—Why didn ’t you buy a new car？—I would have bought one if I _______ enough money.
A. had
B. have had
C. would have
D. had had
结核菌素皮肤试验用于检测（）
A. Ⅰ型变态反应
B. Ⅱ型变态反应
C. Ⅲ型变态反应
D. Ⅳ型变态反应
E. Ⅴ型变态反应
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