题目内容

To go to bed early and to get up early ___ a good habit for us.

A. are
B. is
C. were
D. was

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The discovery of new evidence led to _____.

A. the thief having caught
B. catch the thief
C. the thief’s being caught
D. the thief to be caught

视路疾病最常见的表现是

A. 视力下降
B. 视物变形
C. 视野缺损
D. 色觉异常
E. 夜盲

防止变形和开裂，可采用原则。

A. 顺序凝固原则
B. 同时凝固原则

控制S、P含量，可防止铸件产生裂纹缺陷。

A. 对
B. 错