—Is there any vaccine(疫苗) against H1N1 flu that can be used on humans?
—No, but scientists are working to develop ________ .
| A．that | B．it | C．one | D．so |
相关试题
Nowdays,there is a ______ increase in children`s creativity ,for they are greatly encouraged to develop their talents.
| A．sharp | B．slight | C．natural | D．modest |
-It`s nice .Never beforesuch a special drink!
-I`m glad you like it.
| A． | I have had | B． | I had | C． | have I had | D． | had I |
I'd prefer tomy judgment until I find all the evidence
.
| A． | show | B． | express | C． | pass | D． | reserve |
The difference in thickness and weight from the earlier version makes the iPad2 more comfortable_______.
| A．held | B．holding | C．be held | D．to hold |
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