Humans not only love eating ice cream, they enjoy (21) it to their pets. Market studies show that two thirds of all dog owners give ice cream to the dogs. (22) , says William Tyznik, an expert in animal nutrition at Ohio State University, "ice cream is not good for dogs. It has milk sugar in it, " he says, "which dogs cannot (23) very well. "
(24) by that knowledge but aware of the desire of dog owners to (25) their companions, Tyznik invented a new frozen treat for dogs that, he says, is more nutritious than ice cream-and as much (26) to eat. The product, called Frosty Paws, is made of a liquid by-product of cheese and milk with the sugar (27) Frosty Paws also contains refined soy flour, water, vegetable oil, vitamins and minerals. It (28) Tyznik, who has also invented a horse feed (called Tizwhiz) and (29) dog focd (named Tizbits) , three years to (30) the Frosty
A. assembles
B. attaches
C. packages
D. labels
Passage 2
It seems to shine unchangingly, pouring out a constant light year after year. But the sun may not be nearly so stable as we suppose. It is now thought to move quickly and irregularly and change in long-term cycles, growing dimmer and then brighter with each passing year. Some even fear that its frequent changing behavior would have a great influence on the Earth’ s climate.
The source of the sun’ s inconstancy is magnetism. Professor William Livingston has developed new theories about its magnetic nature.
"We don’ t yet know what causes sun spots, "he says, "but we now think they ’ re areas of high level magnetism that come up from the sun’ s interior. So strong is their magnetic pull that the highly ionized gas nearby is not able to transmit energy out. "As a result these areas send out less heat and light and thus appear from Earth to be almost dark irregular surface patches.
Sun
A. Fluctuations in Weather Patterns.
B. Magnetism and the Sun Spots.
C. The Size and Number about the Earth' s.
D. Livingston' s New Theory about the Earth' s Climat
We have already covered the topic of network addresses. The first (1) in a block (in classes A, B, and C) defines the network address. In classes A, B, and C,if the hostid is all ls,the address is called a direct broadcast address. It is used by a(2) to send a packet to all hosts in a specific network. All hosts will accept a packet having this type of destination address. Note that this address can be used only as a (3) address in an IP packet. Note also that this special address also reduces the number of available hostid for each netid in classes A,B，and C． In classes A, B, and C, an address with all ls for the netid and hostid (32bits) define a (4) address in the current network.A host that wants to send a message to every other host can use this address as a destination address in an IP packet. However, a router will block a packet having this type of address to confine the broadcasting to the (5) network. Note that this address belongs to class E.
空白（1）处应选择（）
A.氯霉素注射液用水稀释时出现沉淀
B.药物进入体内过程中，受竞争抑制剂的抑制
C.酶诱导剂促进其他受影响药物的生物转化
D.服弱酸性药物时碱化尿液
E.与血浆蛋白结合力强的药物将结合力弱的药物置换出来
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