答案:A
be动词的适当形式填空
1. —What color _______ your pencils?
—They _______ blue.
2. —How ______ Frank?
—He ______ fine, thanks.
3. The jackets ________ green.
4. —________ you Tony?
—Yes, I _______.
5. Those ________ her brothers.
6. Here _______ my family photo.
7. I _______ Helen. You ________ Tony.
根据国家标准,不属于安全服务的是()。
A、鉴别
B、访问控制
C、不可否认
D、流量控制