4.In my opinion, the future of bicycle is very promising.

4.In recent years, we have invested more in basic science, but I think the investment ratio is still .

4.In order to keep better work-life balance and reduce stress, try to avoid taking work home with you.

4.In your meeting invitation, clearly state_______. A: the agenda of the meeting B: profile of the company C: price of participating the meeting D: content of the meeting

Complete the following sentences by translating the Chinese into English based on Text A, Unit 4.In welcoming you to the university, I __________(让我想起）my own high school graduation and the photograph my mom took of my dad and me.

4.In the study conducted by Harvard University, what participants be told before they went through the social stress test？ A: They were told to think their stress response as harmful. B: They were taught to rethink their stress response as useful. C: They were taught to prepare some problems. D: They were told to do some active reaction deliberately.

在所给的算式中，填上+、-、×、÷和（ ），使得下面算式成立。（1）4 4 4 4＝1（2）4 4 4 4＝1（3）4 4 4 4＝2（4）4 4 4 4＝3[8分]

数列-4, 4, -4, 4, -4…….

表达式4^4\4*4*4/4 Mod 4的值是

【多选题】在下面 4 个 4 中间填上适当的运算符号和小括号使算式成立。 4 4 4 4=2 A. 4÷ 4 +4÷ 4=2 B. 4× 4÷ （ 4+ 4 ） =2 C. 4+ 4 +4 ×4=2 D. 4- （ 4 +4 ） ÷4=2 答