Nowadays, the iron and steel industry ________ an important part in our national economy.
A. plays
B. played
C. play
D. playing
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Mr. Wells, together with all the member of his family, ________ for Europe this afternoon.
A. are to leave
B. are leaving
C. is leaving
D. leave
The statesman and writer you talked with last month ___ at today's conference.
A. was present
B. was presenting
C. were present
D. were presenting
血液中生物活性最强的甲状腺激素是
A. 碘化酪氨酸
B. 四碘甲腺原氨酸
C. 二碘酪氨酸
D. 三碘甲腺原氨酸
E. 逆-三碘甲腺原氨酸
碘在甲状腺泡中的贮存形式是
A. 单碘酪氨酸
B. 双碘酪氨酸
C. 三碘甲腺原氨酸
D. 甲状腺球蛋白
E. 甲状腺素
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