一个四棱锥和一个三棱锥恰好可以拼接成一个三棱柱.这个四棱锥的底面为正方形，且底面边长与各侧棱长相等，这个三棱锥的底面边长与各侧棱长也都相等．设四棱锥、三棱锥、三棱柱的高分别为
，
，
，则
（ ）
A． |
B． |
C． |
D． |
______ to too much sunlight, as is generally considered, will add to the potential of catching skin cancer.
| A．Being exposed | B．Exposed | C．Exposing | D．To expose |
— Mr. Smith was really helpful when you were in financial difficulty during those years.
— Definitely. I can never appreciate his kindness ________.
| A．seriously | B．well | C．enough | D．properly |
— ______ the woman with the baby come over? We have a seat here.
— Thank you, sir. Actually I do have my seat here. But my baby likes to look out of the window.
| A．Would | B．Shall | C．Must | D．May |
With your help, there is no doubt ______ our plan is meant for will work out successfully.
| A．that what | B．whether that | C．what that | D．that whether |
— Have you seen my email about our TESL project?
— Yes. Luckily, I checked my emails yesterday. Normally, I _____ my email-box for days.
| A．haven’t opened | B．didn’t open | C．hadn’t opened | D．don’t open |