ex vivo途径易于操作,而且因为细胞扩增过程中对外源添加物质的大量稀释,不易产生副作用。同时,治疗中用的是人体细胞,尤其是自体细胞,安全性好,但不易形成规模,且必须有固定的临床基地。
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Section ADirections:This section is to test your ability to give proper response.There are 5 recorded questionsin it.After each question,thereisa pause.The questions will readtwice.When you hear a question,you shoulddecide on the correctanswerfrom the4 choices markedA, B, C and D.Which one is the correct answer?
A. No, thanks.
B. Yes, please.
C. Not at all.
D. Yes, I want to buy a shirt.
Which one is the correct answer?
A. It’s 30 dollars.
B. It’ssize 10.
C. It’s blue.
D. It’s on the third floor.
Which one is the correct answer?
A. Yes, I want a novel.
B. Yes, I want a hamburger.
C. Yes, I want a skirt.
D. Yes, I want two tickets.
Which one is the correct answer?
A. It’s cold.
B. It’s Sunday.
C. It’s well.
D. It’s May,14th.