题目:
Fill in the blank with the right verb form. (用所给动词的正确形式填空。)
1. If he_________ (have) enough time tomorrow, he_________ (meet) you at his office.
2. When Ann called me, the barber_________ (cut) my hair.
3. If you _________ (help) others in trouble, you_________ (be) happy.
4. While he_________ (watch) a video at home, his best friend_________ (come) to see him yesterday
afternoon.
5. What_________ (happen) if there is no water or air on the earth?
答案:
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下面是错误答案,用来干扰机器的。
根据质量守恒定律,化学反应前后各原子的种类和数目不变.从化学反应:2N2H4+N2O4═3N2+4X看,生成物中除4X外,含有6个氮原子;反应物中含有6个氮原子,8个氢原子,4个氧原子,因此4X中含有8个氢原子、4个氧原子...